Burner tip for multigas burner

ABSTRACT

The top of an enclosure defining a mixing chamber is formed of sheet metal having apertures therein through which the gas-air mixture freely flows to form the main flames. Adjacent the apertures, the sheet metal is slit and displaced inwardly in the form of a web defining parallel slots along its sides from which the mixture flows to form adhering flames.

United States Patent inventors Helmut Schmidt Aui Altenstadt Remscheid-Relnshngen; Georg Heln, lluckeswagen, both 01 Germany Appl. No. 18,995

Filed Mar. 12, 1970 Patented Nov. 9, 1971 Assignee Joh. Vaillant KG Remscheld, Berghauser Strasse Germany Priority Apr. 5, 1969 Germany P 19 17 509.8

BURNER TIP FOR MULTIGAS BURNER 8 Claims, 4 Drawing Figs.

U.S. Cl 431/349, 239/566 Int. Cl A0ln 9/20,

A6lk 27/00 [50} Field 01 Search 4. 431/349 [56] References Cited UNITED STATES PATENTS 3,526,367 9/1970 Trihey 431/349 X FOREIGN PATENTS 1,414,633 9/1965 France 431/349 Primary Examiner-Carroll B. Dority, Jr. Attorney-Darbo, Robertson & Vandcnburgh ABSTRACT: The top of an enclosure defining a mixing chamber is fonned of sheet metal having apertures therein through which the gas-air mixture freely flows to form the main flames. Adjacent the apertures, the sheet metal is slit and displaced inwardly in the form of a web defining parallel slots along its sides from which the mixture flows to form adhering flames.

PATEN-TEuunv 9 l9?! 3.6 19. 1 0O Fig. 1

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HELMUTJCHM/DT Al/f ALTENSTA 0r GEORG HEIN IN V EN TORS paw 6% a BURNER TIP FOR MULTIGAS BURNER BACKGROUND AND SUMMARY OF THE INVENTION A type of multigas burner, which is prior art, is disclosed in German Pat. specification l,2l9,878. Through the use of a punch press stamping, webs are displaced from the surface of a burner insert to define gas-mixture slots on the burner surface. By the stamping, the height of the gas outlet slots can be dimensioned accurately. Across the total length of the vertical slot openings thus formed gas streams of relatively low discharge speed, opposed to each other and decelerating each other by turbulence are obtained, whereby lifting of the flame is avoided across the total slot length. With a burner according to the aforesaid patent specification, the total gas-air mixture is discharged through these slots. Due to the opposed gas streams, the whole combustion mixture is therefore decelerated. Now, it is the general intention to utilize the flow energy of the jet of combustion mixture discharged from the burner outlet as much as possible for the intake of secondary air. This intention is significantly impaired by the arrangement according to the above patent.

Also, it is prior art to provide adhering or auxiliary flames in the vicinity of main burner flames. The former are flames which are discharged at a speed reduced with respect to the main burner flames. They prevent the main flames from lifting. By way of example, these adhering flames are produced by branching off a proportion of the gas-air mixture flowing to the main flames from the burner chamber and directing the same through a relief chamber from which the combustion mixture feeds the adhering flames. In another embodiment, adhering flames are provided by causing the mixture leaving a burner slot to discharge in two opposed partial streams at the end of the burner slot. The deceleration of the two partial streams caused thereby also produces an adhering flame. At the same time, the main burner flame is provided at the intermediate section of the common burner slot, which is supported by the adhering flame and the discharge energy of which is free to take in secondary air.

It is an object of this invention, in a burner tip for multigas burners of the type indicated hercinbefore to utilize a sufficient proportion of the flow energy of the gas-air mixture for secondary air intake.

According to the invention, a burner tip of the type indicated hereinbefore is adapted so that the sheebmetal insert also comprises punched-bumer apertures to provide the main flames, freely discharging without being decelerated, and which are prevented from lifting by the adhering flames produced at the vertical gas outlet slots along the web.

The invention may be realized in such a manner that between two respective main-flame burner apertures or slots there are provided a pair of adhering-flame burner slots formed by a downwardly stamped web and disposed in vertical planes.

Also, the main-flame burner apertures may be provided at least partly in the inwardly stamped webs by which they define the adhering-flame burner slots. Thus, a straight discharge of the combustion mixture upwardly through the main-flame burner apertures is effected. At the same time, adhering flames are provided on both sides of each of these main flames or on both sides of a portion of these main flames by a deceleration of the inclined gas streams discharged through the adhering-flame burner slots due to impact with the vertical gas stream of the main flame.

It has been noted that the height of the gas outlet slots in the arrangement, according to the German Pat. specification 1,219,878, may increase due to heating when the burner is operated so that a greater amount of combustion mixture discharges than would be desirable. In a further modification of the invention, the adhering-flame burner slots are formed by several individual webs, longitudinally aligned. Thus, the burner slot is divided into several slots of small length so that shorter webs are provided. Thus, the possible enlargement of the vertical gas outlet slots will remain within narrow limits, when heated.

DESCRIPTION OF THE DRAWINGS FIG. I is a longitudinal section through a portion of the sheet-metal burner insert;

FIG. 2 is a view similar to FIG. I of a modified form;

FIG. 3 is a similar view of a further modification; and

FIG. 4 is a cross section through the sheet-metal insert at right angles to FIGS. 1-3.

DESCRIPTION OF SPECIFIC EMBODIMENTS The following disclosure is offered for public dissemination in return for the grant of a patent. Although it is detailed to ensure adequacy and aid understanding, this is not intended to prejudice that purpose of a patent which is to cover each new inventive concept therein no matter how others may later disguise it by variations in form or additions or further improvements. The claims at the end hereof are intended as the chief aid toward this purpose, as it is these that meet the requirement of pointing out the parts, improvements, or combinations in which the inventive concepts are found.

Each of the figures illustrates the upper portion of a housing defining a gas-air mixing chamber. In FIG. 1 reference numeral 1 designates a sheet-metal insert forming the top of the housing. Insert 1 has apertures or slots 2 and 3 punched through its surface to define the main flames 4 and 5. Between main burner apertures 2, 3 is an inwardly stamped web 6. Since web 6 is displaced from the plane defined by the main surface of the insert 1, the two define vertical slots along each side of the web. The height s of these slots is dimensioned so small that an adhering flame 8 is formed of the two partial gasmixture streams 7 and 7 The adhering flame 8 serves to support the adjacent main flames 4 and 5.

In the embodiment of FIG. 2, the outlet apertures 9 and 10 for the main flames l1 and 12 are provided in the webs l3 and 14. The partial streams 7 and 7 impinge upon the base of the main flame 11 (or l2), and by turbulence with a portion of the main flame form adhering flames 15 and 15'.

In the FIG. 3 embodiment, there is an aperture 18 in the web to form a main flame 20. It is supported by adhering flames 19 and 19, which in turn also support two main flames l6 and I7 discharging from apertures at opposite sides of the web.

FIG. 4 could be a cross section at right angles to any of FIGS. 1-3. It illustrates how the web (for example 6) does not extend completely across the burner insert 1, but instead is divided into a plurality of individual webs 21, 21', 21" which are longitudinally aligned with respect to each other.

A multigas burner, as referred to in the specification and the appended claims is a burner particularly adapted for use with different types of gas having diflerent flame-propagation velocities, e.g. manufactured gas and propane. In the "adhering flames," such as 8, the gas outlet velocity is reduced, so that these flames do not lift from the insert 1 even when gases having low flame-propagation velocity are used. These adhering flames, in turn, ignite the main flames near their bases and prevent lifting of these main flames. With gases having a high flame-propagation velocity, there are little problems in this respect. Therefore burners of this type can be used with quite different gases.

We claim:

1. In a multigas burner having a burner housing defining a mixing chamber with one surface of the housing being a sheetmetal insert, the improvement comprising:

said insert having a web portion thereof displaced to one side of the remainder of the surface to define gas-mixture outlet slots parallel with respect to each other through which gas-mixture is discharged to provide adhering flames, said web being displaced inwardly, with respect to said chamber, of said surface whereby said slots on each side of the web are positioned so that said adhering flames are directed generally toward each other, and said insert having main burner apertures immediately adjacent said slots through which apertures gas-mixture flows without being decelerated to provide the main flames which are prevented from lifting by the adhering flames.

defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis.

7. In a burner as set forth in claim 3, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis.

8. In a burner as set forth in claim 4, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis. 

1. In a multigas burner having a burner housing defining a mixing chamber with one surface of the housing being a sheetmetal insert, the improvement comprising: said insert having a web portion thereof displaced to one side of the remainder of the surface to define gas-mixture outlet slots parallel with respect to each other through which gasmixture is discharged to provide adhering flames, said web being displaced inwardly, with respect to said chamber, of said surface whereby said slots on each side of the web are positioned so that said adhering flames are directed generally toward each other, and said insert having main burner apertures immediately adjacent said slots through which apertures gasmixture flows without being decelerated to provide the main flames which are prevented from lifting by the adhering flames.
 2. In a burner as set forth in claim 1, wherein said web is between two main-flame apertures.
 3. In a burner as set forth in claim 2, wherein said web has a main-flame aperture therein.
 4. In a burner as set forth in claim 1, wherein said web has a main-flame aperture therein.
 5. In a burner as set forth in claim 1, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis.
 6. In a burner as set forth in claim 2, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis.
 7. In a burner as set forth in claim 3, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis.
 8. In a burner as set forth in claim 4, wherein said web defines a longitudinal axis and said insert includes a plurality of corresponding webs positioned in sequence along said axis. 